Hi,
I would like to know , how to concatenate two command in one line and get the display in one screen
for eg
command 1 : ls -l /data/logs
command 2 : ls -l /data/errors
output shd be
/data/logs /data/errors
xx-xx-xx-xx abc.log xx-xx-xx-xx... (9 Replies)
can pipe sychronize thread or process? because I'm trying to create 5 thread or process that can take an integer value and display it. each time a thread display the value, it has to be decrement it by 1 until the value has reach 0. The problem that I'm having is how can that integer value be... (1 Reply)
I have the following code which works on AIX 4.3 but fails at times on AIX 5.3
with:
cat: 0652-054 cannot write to output. There is no process to read data written to a pipe.
validator="${validator_exe} ${validator_parms}"
cmd_line="${CAT} ${data_file} | ${validator}... (6 Replies)
Hi.. I am hoping someone could assist me with the pipe program I wrote below. I want to have communication from parent to child and then child to parent.. Is my logic right?
int p,p1;
pipe(p);
pipe(p1);
pid_t pid = fork();
if(pid == 0)
{
close(p);
close(p1);
dup2(p,0);... (1 Reply)
Hi Everyone,
The machine I'm working on is an AIX 5.3 LPAR running on a P650. oslevel -r shows 5300-08. I'm trying to take a backup to a SCSI tape drive, which has been working up until this point. I know of nothing that has changed recently to cause this problem. But when I try to take a... (0 Replies)
Hi there,
I was wondering if it was possible to pipe stderr to another process.
I need to eval commands given as arguments and I would like to redirect stderr to another process.
I can redirect stderr to a file like this...
toto:~$ command="one=1"
toto:~$ eval $command 2> error
toto:~$... (5 Replies)
We use SAP application cluster on AIX. Communication between 2 of its instances is failing randomly with the following error:
java.net.SocketException: There is no process to read data written to a pipe.
The above error causes a cluster restart if an important communication fails.
Can... (0 Replies)
Hi,
I've came across an issue with a script I've been writing to check DHCP addresses on an Solaris system, the script has been running reasonably well, until it hit the following problem:
./sub_mon_v2: redirection error: cannot duplicate fd: Too many open files
./sub_mon_v2: cannot make... (3 Replies)
Team,
I have multiple batchjobs running in VM, if I do ps -ef |grep java or tomcat I am getting multiple process list.
How do I get my exact tomcat process running and that is unique? via shell script? (4 Replies)
Discussion started by: Ghanshyam Ratho
4 Replies
LEARN ABOUT V7
pipe
PIPE(2) System Calls Manual PIPE(2)NAME
pipe - create an interprocess channel
SYNOPSIS
pipe(fildes)
int fildes[2];
DESCRIPTION
The pipe system call creates an I/O mechanism called a pipe. The file descriptors returned can be used in read and write operations. When
the pipe is written using the descriptor fildes[1] up to 4096 bytes of data are buffered before the writing process is suspended. A read
using the descriptor fildes[0] will pick up the data. Writes with a count of 4096 bytes or less are atomic; no other process can inter-
sperse data.
It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent fork calls) will pass data
through the pipe with read and write calls.
The Shell has a syntax to set up a linear array of processes connected by pipes.
Read calls on an empty pipe (no buffered data) with only one end (all write file descriptors closed) returns an end-of-file.
SEE ALSO sh(1), read(2), write(2), fork(2)DIAGNOSTICS
The function value zero is returned if the pipe was created; -1 if too many files are already open. A signal is generated if a write on a
pipe with only one end is attempted.
BUGS
Should more than 4096 bytes be necessary in any pipe among a loop of processes, deadlock will occur.
ASSEMBLER
(pipe = 42.)
sys pipe
(read file descriptor in r0)
(write file descriptor in r1)
PIPE(2)